Add UMA for WebBluetooth RSSI signal strength level

content/browser/bluetooth/bluetooth_metrics.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_METRICS_H_
 #define CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_METRICS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 258 matching lines @@
 // Characteristic.startNotifications() Metrics
 // There should be a call to this function for every call to
 // Send(BluetoothMsg_StartNotificationsSuccess) and
 // Send(BluetoothMsg_StopNotificationsError).
 void RecordStartNotificationsOutcome(UMAGATTOperationOutcome outcome);
 
 // Records the outcome of a cache query for startNotifications. Should only be
 // called if QueryCacheForCharacteristic fails.
 void RecordStartNotificationsOutcome(CacheQueryOutcome outcome);
 
+enum class UMARSSISignalStrengthLevel {
+  LESS_THAN_OR_EQUAL_TO_MIN_RSSI,
+  LEVEL_0,
+  LEVEL_1,
+  LEVEL_2,
+  LEVEL_3,
+  LEVEL_4,
+  GREATER_THAN_OR_EQUAL_TO_MAX_RSSI,
+  // Note: Add new RSSI signal strength level immediately above this line.
+  COUNT
+};
+
+// Records the raw RSSI, and processed result displayed to users, when
+// content::BluetoothDeviceChooserController::CalculateSignalStrengthLevel() is
+// called.
+void RecordRSSISignalStrength(int rssi);
+void RecordRSSISignalStrengthLevel(UMARSSISignalStrengthLevel level);
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BLUETOOTH_BLUETOOTH_METRICS_H_